I need to see the first part of the question.
You need to find the multiplier for a 10% percentage decrease, and then find how many times that multiplier must have been applied to give a value of less than £35 000.
For a slightly different question, let's say that in January a dress cost $150, and the price decreased by 5% each month.
The multiplier for a 5% decrease is
1−1005=1−0.05=0.95After one month in this case, the new price of the dress is:
£150×0.95=£142.50 (February price)
After a second month, the new price would be:
£142.50×0.95=£135.38 (March price)
Say I need to find what month the price will be under $120
£135.38×0.95=£128.61 (April)
£128.61×0.95=£122.18 (May)
£122.18×0.95=£116.07 (June)
So the price of the dress is under $120 from June.
You can apply the same to your question, but remember, first work out the correct multiplier for the 10% decrease in your question.